Duilin can refer to:
- Duilin (elf of Gondolin), a lord who led the House of the Swallow in the Lost Tale of "The Fall of Gondolin".
- Duilin (son of Duinhir), a Gondorian soldier who lived during the War of the Ring and died in the Battle of the Pelennor Fields.
- Duilin, the father of Saelon, a character from the The New Shadow.
- The nightingale, or "dusk-singer", which is duilinn in Sindarin.
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